High idle/surge after tb and smim install

[jpmxrider489]

I recently just installed a jmfab intake and 1g tb. I did a full emmissions delete. I capped off the lines on the tb. I dont hear any leaks. Everything on my car was fine untill now. My isc was at 30 before and now its at 73. Could the the isc motor be bad in the 1g fiav? Should I switch the other fiav over. My tps and cable is fine and the plate is completly shut. My idle was at 2800. Then when I losen the biss thats when it starts to surge, It goes down to 2600 then back up. What do you think I should do. Whats this in the pic?

 

[92AWDHX40]

It came off my 1g too i believe its a resistor that keeps noise out of the radio system, it goes on the firewall, on the firewall with a black box next to it, if im mistaken. AGain i think its some sort of filter.

 

[jpmxrider489]

I also figured out I have a cracked isc O ring. Could that be my problem?

 

[92AWDHX40]

Yes it sure could, easy fix.

 

[jpmxrider489]

I just went out and see if I can feel leaking air but I cant. Could it still be the problem.

 

[GSLENK]

An air leak in the tb will cause massive problems. You dont have to hear it for it to cause surging. Just spray soapy water on everything to find leaks. use new gaskets on the tb. tighten everything down.

I was checking my tb after install and i got surging. I torqued the bolts down no more surging. they were already pretty tight before, just not tight enough. The isc controls idle, so naturally if that o ring is leaking it WILL affect your idle.

 

[jpmxrider489]

Just replaced the o ring and still surging. Any other obvious ideas?

 

[92AWDHX40]

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)


Read this lots of info for idle surge.

 

[01GSX]

Most likely the buttom part of the TB is bad... Did you hook up the coolant lines or not?
When I swapped my TB out i used the buttom part from my 2g TB which I knew was good.

 

[jpmxrider489]

I did not switch over fiav. Is there a way to test that? If that is broke then would my isc reading be off?

 

[92AWDHX40]

Have you tested the isc? Boost leak test, if you havent already, check couplers if you have any, lines, etc.

 

[jpmxrider489]

The isc is good but if the fiav is bad would that throw the isc reading to be off? I guess tomorrow I'll put on my 2g tb and see if t fixes it. If it does I'll assume it's the fiav.

I think I worded that wrong. If the fiav is bad, would that make the isc reading to be wrong?

 

[boostwut]

a bad seal anywhere in the system will give you bad idle so replace that ring and do boost leak test to make sure nothing is bad like the tb gaskets for example.

 

[jpmxrider489]

Ok I just replaced the seal and fiav. Which brought the idle down to 2000 but still not where I want it. Any other ideas?

 

[Calan]

Is the throttle stop (idle switch) and throttle cable adjusted properly? If more air is getting past the TB than the ISC can compensate for, you'll have idle surge. Could be caused by improperly-adjusted TB, leaky or improperly adjusted BISS, vac leak, etc.

You just have to track down where excess air is entering the IM from.

 

[jpmxrider489]

Everything is adjusted right. But the isc is supposed to be 30 but it's at 70.

 

[Calan]

If the ISC can't modulate airflow to maintain a steady idle, then:

1. Something isn't adjusted properly, or
2. There is a problem with the ISC circuit (ISC, ECU, or wiring), or
3. There is a leak that is allowing air to bypass the ISC.

Ignition timing advance also plays a part in maintaining idle, but as long as base timing is close to what it should be (5* BTDC), then it shouldn't be a factor.

 

[jpmxrider489]

Got it to be a steady idle at 2000 and no surge. Tomorrow I'll double check for boost leaks and my isc.

 

[zonerdck]

TPS could also cause this problem it should be checked just because it is easy to do.

 

[jpmxrider489]

The tps in dsmlink is correct.

 

[jpmxrider489]

Well I know its been awile since I posted here but I did a BLT and turns out a coupler wasnt tight all the way and found out I had a few little ones. I fixed the one on my injector (bad O ring) and the huge one on the coupler. My isc is leaking a very little bit. I didnt fix that one all the way but got most of it fixed. But the idle went down to 1300. But that was with the car not warmed up all the way. Its in a garage and smelled up the house. So I think when it warms up all the way it will be at 1000 which is what I want. But heres the problem. I installed a COP and my idle went up 200 rpm, so now its at 1300. I dont know much about COP so whats your experience on fixing idle? Get different plugs?

Just incase, Heres a pic of it.

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[snowborder714]

Remove the coil pack and replace it with the stock ignition. Or if you want it to work properly, get a CDI.

 

[JwpRider]

Can you please explain 'why' changing to a COP would change the Idle speed? I don't know much about COP but...you still have your power transistor that 'triggers' the coils. Is this 'typical' when changing to a COP setup?